On a Fogatti RV Tankless Water Heater # LSB64FR an E0 error means that the outlet temperature probe is open or shorted and EC means that there is a communication error between the thermostat/controller and the unit. I recommend first checking your wiring to ensure that there isn't any loose or damaged connections.
The two blue wires need to be connected to the two wires on the thermostat for it to properly communicate. I recommend checking your ground as well, as a bad ground can cause... view full answer...
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